If you are interested in 5 star hotels in Hua Hin, Marsilius, may I suggest the following hotels, the details of which I have taken from Booking.com - https://www.booking.com/city/th/hua-hin.en-gb.html
I have not however stayed at any of them, but over an 8 -10 year period I have eaten in their restaurants, swam in some of their pools or, in the case of the Hilton, used their gym and swimming pool as well as eating in one of their restaurants. If I wanted pampering in 5 star hotels in the centre of Hua Hin I would choose either the Hilton or the Centara.
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Centara Grand Beach Resort & Villas Hua Hin (5 stars)
This is a Preferred Partner property. It is committed to providing guests with a positive experience thanks to its commendable service and good value. This property may pay Booking.com a bit more to be in this Programme.
Hua Hin Night Market, Hua Hin (500 yards from centre) – Beach nearby.
Featuring 4 outdoor pools in beautifully landscaped grounds, Centara Grand Beach Resort & Villa Hua Hin is a 5-minute walk from the Night Market and Fishing Pier. It has a spa and 4 restaurants.
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Hilton Hua Hin Resort & Spa (5 stars)
This is a Preferred Partner property. It is committed to providing guests with a positive experience thanks to its commendable service and good value. This property may pay Booking.com a bit more to be in this Programme.
Hua Hin Night Market, Hua Hin (450 yards from centre) – Beach nearby.
Overlooking the Gulf of Thailand, Hilton Hua Hin offers prime beachfront accommodation with stunning views and access to a first-rate spa. It features a beach-side pool and 5 dining options.
In high demand! Booked 26 times in the last 24 hours.
Another 5 star hotel and resort is the superb Dusit Thani, but it is 9.3 miles from the town centre.
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Dusit Thani Hua Hin hotel (5 stars)
This is a Preferred Partner property. It is committed to providing guests with a positive experience thanks to its commendable service and good value. This property may pay Booking.com a bit more to be in this Programme.
Cha Am (9.3 miles from centre)
Overlooking the Gulf of Thailand, Dusit Thani Hua Hin sits on Thailand’s western coast, steps from a private beachfront. It boasts a large outdoor pool, spa and fitness facilities.
In high demand! Booked 4 times in the last 24 hours.
Just 2.5 miles from the town centre is the 5 star Hyatt Regency:
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Hyatt Regency Hua Hin hotel (5 stars)
This is a Preferred Partner property. It is committed to providing guests with a positive experience thanks to its commendable service and good value. This property may pay Booking.com a bit more to be in this Programme.
Khao Takiab, Hua Hin (2.5 miles from centre) – Beach nearby.
This luxurious 5-star beachfront property boasts a large lagoon pool set in 12.5 acres of tropical landscapes.
Just south of Hua Hin, in Kao Takiap, 3.7 miles from the town centre is the 4 star Anantasila beach front hotel:
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Anantasila Villa by the sea, Hua Hin Beachfront (4 stars)
This is a Preferred Partner property. It is committed to providing guests with a positive experience thanks to its commendable service and good value. This property may pay Booking.com a bit more to be in this Programme.
Khao Takiab, Hua Hin (3.7 miles from centre) – Beach nearby.
A lovely beachfront property just outside Hua Hin Town, Anantasila Villa offers a relaxing getaway with an outdoor pool and sea-facing restaurant. Rooms and villas are nestled amidst tropical gardens....
I hope some of the above recommendations give you food for thought, Marsilius.